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Natsuo Fujii, a high school student, harbors an unrequited love for his cheerful teacher, Hina Tachibana. At a mixer, he meets Rui, a reserved girl, and they share an impulsive intimate encounter. Natsuo’s life complicates when his father remarries, introducing Hina and Rui as his new stepsisters. Living together, Natsuo navigates his feelings for Hina, who remains kind but distant, and Rui, who keeps her emotions guarded. The trio’s new family dynamic sparks tension and unspoken attractions, setting the stage for a complex triangle.
